Emergency Acute Alimentary Infections & Inflammations

Intussusception

Acute Bowel Invagination and Obstruction

Primary risk age: 3 Months to 3 Years (Peak: 5 to 9 Months)

Urgency: Emergency
Typical age: 3 Months to 3 Years (Peak: 5 to 9 Months)
Body system: Gastrointestinal System

Typical course: 1 to 3 days after non-surgical reduction; 5 to 7 days if surgery is required.

Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13

1. Summary & Pathophysiology

Acute Bowel Invagination and Obstruction

Pathophysiology (Development Path)

A segment of the intestine invaginates (telescopes) into an adjacent segment. This compromises venous and lymphatic drainage, causing bowel wall edema, bleeding, and potential bowel necrosis or perforation.

Primary Causes & Etiology

Idiopathic in most infants; may be associated with viral hypertrophied Peyer's patches (e.g. Adenovirus) or lead points like Meckel's diverticulum in older children.

2. Symptom Continuum

Early Onset Signs
Sudden onset of severe, episodic, cramping abdominal pain. The child draws knees to the chest and cries inconsolably, then behaves normally between episodes.
Progressive Phase
Vomiting (initially non-bilious, progressing to bilious), lethargy, and a palpable sausage-shaped mass in the right upper abdomen.
Severe Indicators
Passage of 'currant jelly' stools (stools containing blood and mucus), abdominal distention, shock, peritonitis, and grunting respiration.

3. Clinical Verification

Abdominal ultrasound is the gold standard, showing a 'target' or 'donut' sign.

4. Care & Elements Plan

Primary Care Treatment Plan

Stabilize with IV fluids. Perform non-operative reduction using an air or contrast enema. Surgical reduction is required if enema fails or there are signs of perforation.

Home Support Elements

Not applicable. This is a medical emergency requiring immediate hospitalization.

Generic Active Ingredients (No Brands)

Intravenous fluids (active fluid resuscitation)
Cefotaxime or Metronidazole (prophylactic antibiotics if surgery is required).

Lists active elements only. Never administer self-designed therapies.

5. Doctor Critical Lines

Critical Thresholds: When to See a Doctor

Seek immediate emergency care if a child has episodic severe pain, draws knees to chest, vomits bilious fluid, or passes bloody stools.

6. Vaccine & Prevention

Routine Prophylaxis (Prevention)

None available.

Immunization Context

Rotavirus vaccination is sometimes associated with a tiny risk variation but is overall protective against severe gastroenteritis. Ensure vaccines are given on time.

7. Timelines & Outlook

Active Timeline

1 to 3 days after non-surgical reduction; 5 to 7 days if surgery is required.

Expected Prognosis

Excellent if reduced early (within 24-48 hours). Delay can lead to bowel resection or mortality.

Potential Untreated Complications

Bowel necrosis, bowel perforation, peritonitis, sepsis, and hypovolemic shock.

Moderate

Rotavirus Gastroenteritis

Acute Viral Enterotoxin-Mediated Intestinal Infection

Infants and toddlers aged 3 to 24 months (Highly contagious)

Emergency

Pediatric Appendicitis

Acute Obstruction & Inflammation of the Vermiform Appendix

School-aged children and adolescents (Peak incidence: 10 to 19 years; rare under 2 years)

Severe

Pediatric Dehydration

Acute Fluid and Electrolyte Depletion

Infants and Young Children (High risk)